Answer: The correct expression is (A)

Step-by-step explanation: We are given to select the correct expression that gives the volume of a sphere with radius 7 units.
We know that
the VOLUME of a sphere with radius 'r' units is given by

Here, the radius of the given sphere is
r = 7 units.
Therefore, the volume of the sphere will be

Thus, the required expression is

Option (A) is correct.